Malicious PDF — malware analysis report

Static analysis result for SHA-256 427d0fdfde0b903e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 03:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d068c85385ef22471bc9ddbf88be794 SHA-1: dff2a01a2d893209167fa56c5d97afbddf152ebd SHA-256: 427d0fdfde0b903e4f59e2541b8dbbf8ff03dcfffb5cee6b79f19af5d15554f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of many external links point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://beauty-full.ru/uploads/files/vovizox.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130acf82fb51---pesupetiv.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/25279414784.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210905005558.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/xuroxipeledugi.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/vivasejubugugitaxebakotug.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/jatemavutuvesosumaxan.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/rilexuduxoliwasal.pdfIn PDF document text
    • http://ms01bet.net/contents/files/95296431754.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/30789083480.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/muvom.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/49379274120.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/gikife.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/39767296079.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/69293075203.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/97255329221.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/71123853190.pdfIn PDF document text
    • http://contelex.it/userfiles/files/44313965644.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/66331160501.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d99f8aab7---mefodapetajonip.pdfIn PDF document text
    • http://fpole.ru/sadm_files/36675805661.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/26581710503.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/pelilumasiled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+scan+a+barcode+on+a+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 18764 bytes
SHA-256: f7c907e30a91f62b6747695cacd4968fe52e88712228693f4f14bcd501ec45db
font_01_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 10692 bytes
SHA-256: 6b8bdac85134aefa7b8a2b42f1b0ab8578d667fdd0b0bf47af4e7538ae38d3da
font_02_sfnt_off0001277b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1